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Boston Weather: 40.0°F | Light Rain Fog/Mist

Weather: The Rug is Out From Under Us

By Greg Lawson
Staff Meteorologist

After smashing yesterday's high temperature record by ten degrees with a sizzling 76F (33F above normal), today we will be lucky to just reach the climatological mean of 43F. A strong cold front passed over us last night reminding us that it is not in fact actually late spring. The front is the leading edge of a huge trough spanning the length of the United States. The front extends down from Newfoundland all the way through Texas. In spite of the cold air within it, the trough is actually piping winds directly to us from the southwest, right from the Gulf of Mexico. This will feed a small low pressure disturbance forming along the front down in western Tennessee with moisture.

As the low moves up along the front, this could bring us some light rain this afternoon and will ensure some more substantial precipitation late this evening. Forecast models seem to disagree on how quickly this disturbance will leave us. The rain should certainly have left us by early afternoon Wednesday, but may stop as early as midnight Tuesday - I am tending toward the later side. The clouds will clear Wednesday and we will experience the more familiar chilly high pressure pattern that mid-December often offers. There will be relatively clear skies with high temperatures in the low 40s until the next big trough comes through perhaps this weekend?

Tuesday: Perhaps some afternoon sprinkles. Cloudy with rain in the evening. Breezy with approaching low. High of only 40F (4C).

Tuesday Night: Rain will continue and die out in sometime early morning. Clouds begin to clear. Low of 34F (1C).

Wednesday: Mostly clear. Typical brisk December day. High 42F (6C). Nighttime low below freezing.

Thursday Outlook and Beyond: High pressure will continue to bring cool crisp days with few clouds and cool temps. It looks that it will end on Saturday.